1601521605550 has 48 divisors (see below), whose sum is σ = 3132065829600. Its totient is φ = 608379004800.

The previous prime is 1601521605517. The next prime is 1601521605557. The reversal of 1601521605550 is 555061251061.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1601521605557) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8964810 + ... + 9141709.

It is an arithmetic number, because the mean of its divisors is an integer number (65251371450).

Almost surely, 2^{1601521605550} is an apocalyptic number.

1601521605550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1601521605550 is a deficient number, since it is larger than the sum of its proper divisors (1530544224050).

1601521605550 is a wasteful number, since it uses less digits than its factorization.

1601521605550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18106621 (or 18106616 counting only the distinct ones).

The product of its (nonzero) digits is 45000, while the sum is 37.

The spelling of 1601521605550 in words is "one trillion, six hundred one billion, five hundred twenty-one million, six hundred five thousand, five hundred fifty".